On the Boardwalk there is ESPN, Spoodles, the Big River Grille and at dinner, there is Flying Fish. From Epcot, those are a bit closer to walk to than YC/BC. The walk to the Boardwalk is about 10 minutes.
At Beach Club, there is the Beaches and Cream soda shop that serves burgers, hot dogs and good ice cream treats and Cape May. YC has the Captains Grille and the Yachtsman Steakhouse (for dinner). It's probably a 10-15 minute walk from Epcot to here and a 20 minute walk from DHS.
The Dolphin/Swan have several places also. It's probably a 15 minute walk to these resorts from either Epcot or DHS. I've only eaten at dinner places here (bluezoo, Il Mulino) but I know they have some lunch places too.